To be honest, the way the GTX 690 is looking, it might even be overkill for 1440/1600p monitors...

My OC'd GTX 590 currently can average 55-58FPS in BF3 @ 2560x1440, Ultra settings, 2xAA...4xAA just kills it because of the VRAM wall.

Judging by the early 690 benchmarks, it can EASILY do 80+ FPS on BF3 @ Ultra, 4xAA, 16xAF...so I don't think VRAM is going to be an issue in the least bit. Not even GTX 680/680 SLI setups are having issues running 2GB of VRAM. Sure, i'd like 3-4GB, but as it stands....I highly, highly doubt that 2GB is not sufficient for every single game that's out right now and games that will come out within the next 12-18 months.

Battlefield 3 might also not be the best example, since it eats VRAM if it's available, regardless of how much your card has, but it's universally seen as the most graphically demanding game right now, which is why I used it as a reference...